Originally Posted by warner41
I picked up a new Gen4 G22 upper with the intent of buying a Gen4 G31 soon. The 31 will definitely be my next complete purchase. Parts to finish some other builds I have in the works is another story.
The g31 and g22 are identical aside from the barrel. Thats the only thing you need to swap to shoot the other caliber. Mags are the same too.